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Restoration Plan: Arverne
Shorebird Preserve and Katie
May Laumann
Population genetics are important to
consider for this
restoration project, especially because several of the species involved
are
endangered and currently have small populations. Genetic
diversity is the “basis for
adaptation of orgs to changing environments” and “is linked strongly to
life
history traits, particularly dispersal and reprod
mode.” Genetic diversity tends to be low
in small populations and in species like Seabeach
Amaranth that self fertilize and disperse widely;
this is because there is “less gene flow among populations of species
that self
fertilize.” In some ways, this might
make reintroduction of a species simpler; the worry that individuals
from a
certain area will not be well adapted to the introduction area is
reduced if
all populations are genetically similar. (Falk et al. 2006). According to Noss
and Cooperrider, a metapopulation is “a set of
partially isolated populations belonging to the same species” that can
“exchange
individuals and recolonize sites in which the species has recently
become
extinct” (1994). Because plovers disperse to various beaches during breeding
season and
amaranth disperses widely and is extirpated frequently based on habitat
suitability, metapopulation theory applies to this project. According to theory, a minimum viable
metapopulation (mvm) size consists of a
“minimum
number of interacting local populations necessary for long-term
persistence of
a metapopulation.” This minimum number,
typically
between 15 and 20 well connected patches, will cause “balance between
local
extinctions and recolonization,” allowing the metapopulation to persist. Unfortunately, “many rare and endangered
species…fall below mvm size.”
Restoration efforts can “tip the scales toward
greater metapopulation persistence by repeatedly collecting and
introducing new
individuals and by modifying the habitat to increase likelihood of
survival.” This restoration project will
focus on modifying habitat. (Maschinski 2006 in Foundations
of
Restoration Ecology). Habitat modification will be the first step in restoration of the ecosystem and community structure relied upon by and affected by the focal species of this project. “Community structure includes species composition and diversity” as well as species abundance. Communities are composed of core and satellite species. Core species are the most abundant while satellite species are “less freq and less abundant” (Menninger and Palmer). The main species considered in this project could be considered satellite species, as they are “less likely to colonize and more likely to go extinct in patches.” This could make restoration and recovery of these species difficult. In addition to community structure and processes of this community, “ocean-shore interactions” must be considered. This is because in this community spatial boundaries “have been blurred” and “prey, energy, or detritus” from the ocean habitat “subsidizes the community of” the terrestrial shore habitat; shorebirds that utilize the beach consume fish and small shellfish (Menninger and Palmer 2006 in Foundations of Restoration Ecology). Conditions in one habitat could affect conditions in the other. Ideally the processes and functioning of this ecosystem will be restored as the community is restored (Naeem 2006 in Foundations of Restoration Ecology). In restoring habitat for critical species, ecophysiological constraints must be taken into account. If constraints are not considered risk of failure of the species in question and of the restoration is high. All organisms have ecophysiological constraints; in plants these constraints manifest in “capacities to tolerate biotic and abiotic stressors.” “Two basic ecophysiological themes that relate to capacity [of plants] to become reestablished” are light and energy levels and water and nutrient levels. Water availability becomes a problem for amaranth when other plants colonize an area; amaranth is a poor competitor, and loses when there is “competition for water by neighboring plants.” While “water limitation…is… prevalent as a stress” for amaranth, other stressors common to plants- like disturbance and salt- are not a problem (Ehleringer and Sandquist 2006 in Foundations of Restoration Ecology). Just as plants have ecophysiological constraint, the shorebirds being managed for have environmental constraints. Constraints on shorebirds include availability of suitable nesting habitat, suitable foraging habitat, and prey density. For example, for nesting piping plovers require a minimum width beach with a low slope. They also require wrack for foraging. If their environmental requirements are not met a shorebird species will either not colonize and persist in an area or will colonize unsuccessfully. As mentioned, presence of other plants makes survival for amaranth difficult. These other plants could be considered ‘invasive’ in that they “interfere with maintenance of particular vegetation types by outcompeteing more desired species [and] threatening the persistence of rare species.” Ideally, after a disturbance this community would be resilient and “return to predisturbance conditions … within a reasonable time frame following a disturbance without large scale human intervention” (D’Antonio and Chambers 2006 in Foundations of Restortaion Ecology). This resilience would enable the community to withstand invasion or succession of other plants. Unfortunately, the most desired plant species in this community, sea beach amaranth, is intolerant of competition and so colonization of other plant, invasive or native, is often accompanied by extirpation of amaranth. This may be one of the biggest challenges this restoration project will encounter. Invasive or introduced species problems are not isolated to plants. Specifically in this project, the large population of predators on plovers and other shorebirds must be contended with. Sea beach amaranth is
“self-fertile, often showing
extensive selfing” (U.S. Fish and Wildlife Service, 1996). Seeds are dispersed by water and wind, and long-distance dispersal “takes
place primarily
during storm events such as fall hurricanes and winter northeasters.” It has been suggested that amaranth, which is
often “wholly…buried by winter sand movement” might retain some non-dispersed seeds that become buried with
the parent
plant and recolonize the area during favorable conditions.
Seeds are thought to survive in their dormant
state for long periods of time and only germinate and grow when
conditions are
favorable. These reproductive and
dispersal strategies often result in many genetically similar local
populations
within each amaranth metapopulation, and may even result in similar
genetic
structure among all amaranth metapopulations
(Falk et al. 2006). Amaranth is extremely
sensitive to competition and tends to dies out during
succession as
perennial species take root and monopolize water and critical limiting
nutrients (U.S. Fish and Wildlife Service. 1996). Also,
amaranth is generally severely
handicapped by human disturbance; often pedestrians will step on
Amaranth or
drive over it where off-road vehicles are allowed.
To prevent this, during growing and flowering
season all plants outside of the restricted area will be roped off with
symbolic string. Plants within the
restricted area need not be roped off; people are already excluded from
the
area so they cannot negatively affect the plants. Because Amaranth cannot successfully compete with other
plants, particularly
perennials that monopolize water supply and critical nutrients (U.S.
Fish and
Wildlife Service. 1996), a
restoration project
favoring amaranth would ideally prevent establishment of these plants. Amaranth has been somewhat tolerant of off
road vehicle use of its habitat between December and May in In addition to the above habitat modifications, the amaranth
population at Webworm herbivory is also a threat
to
Amaranth. Five species of webworms
(small moth caterpillars) have been known to infest sea beach amaranth. Four species are common to populations in the The reason for restricting use of BT in this area is to
prevent damage
benthic organisms it could potentially damage in the neighboring ocean
habitat. This is of great concern
because, as is common in ocean-shore communities, resources from the
community
of “one habitat (the ocean) subsidize the community of”
the other (the shore community) (Menninger and Palmer, 2006). Piping plovers consume small invertebrates
including marine worms, insects, crustaceans, and mollusks. Because one component of their diet is marine organisms, it
is important to
the survival of plovers that the ocean habitat is maintained. A well-functioning ocean habitat is similarly important to the least tern
colony inhabiting Other threats to prey
species in the restoration
area must be considered and prevented. In 1998 sewage runoff into
seawater occurred in
such great amounts that beaches were closed. The
‘Enhanced Beach Protection Program’ established in the same year
resulted in
more vigilant monitoring and more frequent maintenance actions for
select
sewage treatment facilities (Ryan). This
program seems to have been effective; a Harbor
Water Quality Survey conducted in 1999 found that fecal coliform
bacteria levels in the water had dropped to below100 cells per 100 mL. Levels had
previously reached as high as 300 cells per 100 mL. Monitoring of sewage treatment facilities
should continue and efforts to improve the sewage system will be
made;
the negative effects of another sewage runoff event could be
devastating to the Improving prey resources is just one part of improving Piping Plovers
are endangered migratory
shorebirds that breed on Atlantic Beaches from A study of a Westhampton Island (off of Long
Island)
breeding piping plover population conducted between 2000 and 2005 found
mean
site fidelity to be .83. Other studies
have found site fidelity among piping plovers to be .72 and .99 (Cohen et al., 2006). These three
figures indicate high breeding
site fidelity among piping plovers. Cohen et al. suggest that
piping plovers “may disperse when habitat quality is poor or declining.” This means that high site fidelity is
exhibited when habitat conditions are acceptable and as such can be
used as a
measure of success for the restoration of Increasing the suitability of the Immigration
of plovers from other populations will increase
genetic exchange among piping plovers. In
1993, the breeding population at Several main problems must be addressed in
improving For nesting piping plovers require a beach
at least thirty
meters wide with a slope of less than eight percent (Fraser and Cohen). Beaches must be sparsely vegetated, as
plovers scrape their nests in bare sand. Moist substrate habitat is
essential- plovers
need intertidal areas with possibility of shallow tide pools for
foraging. Wrack- washed up seaweed, terrestrial plants, and
small
dead shellfish- is also beneficial to foraging. A great
amount of
foraging habitat will lead to a higher density of nesting plovers,
faster
growth, and better survival. Human
disturbance constitutes a
threat to piping plovers. Detrimental
human disturbances range from beach stabilization to stepping
on
nests. According to U.S. Fish and
Wildlife, beach stabilization can have adverse effects on Piping
Plovers. Additionally, human “recreational
disturbance
may lower reproductive success” (Cohen et
al., 2006). Thirteen blocks of beach
are closed to humans during piping plover nesting season, but the
entire 13
blocks is not really usable to piping plovers. “Plovers
are easily disturbed” and mere nearness to people
can stress
them (Cape Lookout National Seashore). This
restoration plan calls for restriction of more than
13 blocks to
people during nesting season. 19 blocks
will be closed off, 3 on either side of the current preserve, creating
a buffer
zone between the area available to people and the area used for nesting. Ideally, plovers will expand beyond the 13
blocks they have previously used for nesting and utilize the entire 19
blocks. Dogs are another threat introduced to
plovers by
humans. Unleashed dogs may enter the
nesting area and trample plover nests or frighten adult plovers, who
will
“abandon nests and chicks if they feel threatened” (Cape Lookout
National
Seashore), leaving them vulnerable to predators. Therefore,
Survivability of
young is
extremely important, and, according to metapopulation dynamics, even
small
changes in egg survival and hatching can result in “different estimates
of
extinction risk.”(Falk et al.,
2006) If young plovers do not survive to leave the breeding
ground,
the population decline will continue to extinction. Survival
of The predator problem is exacerbated by
people. Garbage left on the beach provides
food for
predators and has allowed their populations to grow, increasing
predatory risk
to piping plovers and other shorebirds. Better
trash management would combat this and would hopefully lower the
population
sizes of feral cat, gulls, and raccoons. Relatively simple
solutions
that will be implemented are fining for littering, posting signs
discouraging
against littering, providing more garbage receptacles on the beach,
holding
volunteer beach cleanups, and requiring all garbage receptacles in the
Rockaway
Beach area to be covered with lids. Other methods
must be used to
control predation on plover hatchlings. Predator
exclosures can
prevent the main
predators of plovers- gulls, raccoons, feral cats, and foxes- from
preying so
successfully on plovers. Predator exclosures
are built around nests to keep eggs and young from being consumed by
predators. These exclosures are
generally
effective until hatchlings are able to leave the nest. At
that point, they become highly vulnerable
to
predators. Some studies have implemented mammal trapping
programs to reduce predator populations (Lauro
and Tanacredi, 2002). These
programs have been
effective and will be considered for this site in the future. While
implementing these new plans
in the Rockaway Beach Arverne Shorebird
Preserve,
monitoring of plovers from a distance, three days a week should be
occur and
records of the number of plovers present, number of nesting pairs, and
number
of eggs per clutch should be kept. To
track
genetic variability, if at all possible, distinguishing marks should be
noted
on birds nesting at the restoration site. Birds present
should be observed
(from a distance) and taken note of each breeding season, as well as
their
success in breeding, and if their hatchlings survive to leave the
nesting
ground. After the
preliminary measures of
the plan, previously stated, have been put into effect, an after school
program
for interested children should begin. This
program will be designed to educate children about
Piping Plovers
and Sea Beach Amaranth and will teach them the value of preserving
nature. Children will accompany Urban Park
Rangers on
Plover Observations, will aid in putting symbolic fences around sea
beach
amaranth, and will help with beach cleanups. Restoration of
Rockaway Beach
will, of course, contribute to the protection and survival of the focal
endangered species: Piping Plovers, Sea Beach Amaranth, and Least Terns. There are also benefits to humans. The after school program will benefit
children by educating them about environmental issues and endangered
species
conservation. Beach cleanups will result
in a cleaner beach for people to enjoy. Additionally,
some species of Amaranth are being
experimented with as a
food crop. If this species of Amaranth
increases enough it too may be experimented with for food (New Jersey
Department of Environmental Protection). This
plan is beneficial to people and the Timeline Restoration of this area will not be considered complete until: 1.
Sea Beach Amaranth occupies the area for 10 consecutive
years; this time
period is the criteria for recovery in the U.S. Fish and Wildlife’s
‘Recovery
Plan for Sea Beach Amaranth.’ 2.
The Atlantic
Coast Piping Plover Population has reached 2000 mating pairs, the
recovery goal
listed by Cohen, Fraser, and Catlin in ‘Survival
and site fidelity of Piping Plovers on Long Island, New York’. Restoration of
Rockaway Beach will likely
require more than 10 years of dedicated work, depending on how quickly
Piping
Plover and Sea Beach Amaranth populations increase. The following
estimated man-hours and budget
represent amounts of time and money not already being spent by NYC
Urban Park
Ranger efforts at Arverne Shorebird
Preserve. Year
1 Immediately 1. Write to The Maryland Natural Heritage Program to obtain Sea Beach Amaranth genetic isozyme analysis test results. (2 hours to compose and send letter) 2. Write
a letter to the NYC Department of Environmental Protection and to NYC
Waste
Management to encourage pursuit of a better sewage system.
(5 hours to compose and send letter) 3. Begin bi-monthly volunteer beach cleanups. Cleanups will occur in seasonally restricted areas from December to March, and in unrestricted areas year round. 4. Set new garbage cans with caps in convenient areas on the beach, post ‘No Littering’ signs. (12 hrs) About 19 additional hours Spring 5. Identify
the nearest and largest population of Amaranth, obtain permission to
collect
seeds, collect and store seeds during growing season, plant the
following year
(in February). One park ranger will
scout areas bi-weekly and collect seeds once any necessary permission
has been
obtained. (10 hours per month for 3
months) 6. Post signs about
and enforce a Dog Leash
Rule from March to September (2 hours posting
signs) 7. Increase Arverne current restricted 13 blocks to 19 blocks March-Sept 8. Construct
symbolic fences around Sea Beach
Amaranth individuals (30 hours) About 62 additional
hours Winter 9. Begin allowing
Park Rangers to drive on
the beach between December and beginning of March 10. Obtain water
quality test results from
the New York City Department of Environmental Protection when they
become available (4
hours to
obtain and read results) About 4 additional
hours Total Additional
hours Year 1: 85 hours + 15
unexpected hours = 100 NYC Urban Park Ranger hours additional to
already
ongoing work at Arverne. Each
additional year 11. Continue items
1-10 Year
5 12. Begin after
school program; program will
meet 1 day per week every week except for holidays. (5 hrs per week
preparing,
running, and cleaning up after program) 240 hours + 96 unexpected hours
= 336
additional hours Hours
for 1st 5 years: Yearly 100 hours for
5 years = 500 hours +
336 hours for after school program = 886
hours beyond what is already being
done at the Arverne Shorebird Preserve. Budget Year 1: Item 3 on timeline: $100 for garbage bags Item 4 on timeline: $1500 for 10 new garbage cans, $220 for 10 ‘No Littering’ signs Item
6 on timeline: $220 for 10 ‘Dogs Must Be On
Leash’
signs Item 8 on timeline: $310 for 100 stakes and 2400 feet rope for symbolic fences Total
Budget, year 1: $2,350 Years 2-4: Item 3 on timeline: $100 for garbage bags (yearly) total: $300 Item 8 on timeline: $310 for stakes and rope for symbolic fences (yearly) total: $930 Item 4 on timeline: $750 for 5 additional/replacement garbage cans (years 2 and 4) total:$1500 Total
Budget, years 2-4: 2,730 Year
5: Item 3 on timeline: $100 for garbage bags Item 8 on timeline: $310 for stakes and rope for symbolic fences Item 12 on timeline:
$24,000 for one new
employee to run after school program Total Budget,
year 5: 24,410 Other Possible Costs: Possibilities: new predator exclosures, need for BT and more Total: $10,000 TOTAL BUDGET YEARS
1-5: $39,490 Sources " Bacillus
thuringiensis."
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Pair Density
and Reproductive Output on Cohen, Fraser,
and Catlin. "Survival
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Ecological Theory to
Manage or Restore Ecosystems Affected by Invasive Plant Species.”
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Editors: Falk,
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Editors: Falk,
Donald A., Palmer, Margaret A., Zedler,
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A.C. (1993) Natural Enemies of Vegetable Insect Pests.
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A., Zedler, Joy B. Menninger and Palmer. “Restoring
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A., Zedler, Joy B. Naeem. “Biodiversity and Ecosystem
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